Wiseco Mitsu Evo 4-9 4G63 Asymmetric Skirt Bore 85.25mm - Size +.010 - CR 9.5 Piston Set

These Wiseco pistons are forged from 2618 aluminum, a material chosen for its improved tensile strength, making them a solid choice for demanding engine builds. They are specifically designed for the Mitsubishi 4G63 engine found in Evo models 4 through 9. This set features an 85.25mm bore size, which is 0.010 inches larger than stock, and a 9.5:1 compression ratio, intended for performance applications where increased power is the goal.

Wiseco has incorporated several features to enhance performance and durability. The pistons include precision ring grooves, an anti-detonation groove, and additional ring seal features to ensure proper combustion and prevent blow-by. The asymmetric skirt design, combined with the ArmorGlide skirt coating, helps reduce friction and noise while also resisting seizure, even under heavy loads. The fully machined crown ensures accuracy, and forced pin oiling helps keep the wrist pins lubricated during high-RPM operation. These pistons are built to withstand heavy to severe duty performance applications, making them suitable for serious racers and builders.

This set includes four pistons, ready for installation in your 4G63 engine. Please note that these pistons are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures.